<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <link rel="stylesheet" href="./assets/lib/cropper/cropper.css">
  <style>
    .container {
      width: 600px;
      height: 500px;
      float: left;
    }

    img {
      width: 100%;
    }

    .preview-box {
      float: left;
    }

    .preview {
      border: 1px solid #000;
      background-color: #ccc;
      margin: 20px;
      overflow: hidden;
    }

    .w200 {
      width: 200px;
      height: 200px;
    }

    .w100 {
      width: 100px;
      height: 100px;
    }

    .w50 {
      width: 50px;
      height: 50px;
    }

    .w30 {
      width: 30px;
      height: 30px;
    }
  </style>
</head>

<body>

  <div class="container">
    <img src="./assets/images/sample2.jpg">
  </div>

  <!-- 预览区域 -->
  <div class="preview-box">
    <div class="preview w200"></div>
    <div class="preview w100"></div>
    <div class="preview w50"></div>
    <div class="preview w30"></div>
  </div>

  <script src="./assets/lib/jquery.js"></script>
  <script src="./assets/lib/cropper/Cropper.js"></script>
  <script src="./assets/lib/cropper/jquery-cropper.js"></script>

  <script>
    let $image = $(".container img");

    $image.cropper({
      // 纵横比
      aspectRatio: 1,
      // 指定预览区域 (把预览的图片放到哪去)
      preview: ".preview",
    });
  </script>

</body>

</html>